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Na tym trójkącie masz opisane jak liczyć boki ;)
y=wysokość=bok
cos60=x/10
0,500=x/10
x=0,500×10
x=5
y²+x²=10²
y²=100-25
y=√75=5√3
P=1/2×a×h
P=1/2×5×5√3
P=15√3/2